HTML 5 Storage's same origin policy

I've tried with Firefox 4.0 to use the localStor开发者_C百科age object to save a few values used to fill the form at http://host1.example.com/index.html and to fetch those values to automatically fill the same form at http://host2.example.com/index.html but it doesn't work.

Does the same origin policy applies to the url instead of the domain?

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No, it applies to hosts. You could try setting document.domain before you create or retrieve your localStorage objects:

document.domain = "example.com";

--edit

OK, though you can set document.domain that has no impact on localStorage. It is possible to hack together a solution using iframe and cross document messaging: Cross-domain localStorage

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you're out of luck. localStorage cannot be shared between different domains.

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So for example I could set localStorage data at dev.blah.com, and retrieve it from prod.blah.com, as long as I set the document.domain = "blah.com"; ?

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You can't use localStorage or sessionStorage cross the domains or sub-domains just with the original API. You can use some libraries to help sending message between different domains.